A growing body of evidence shows that promoting social and emotional wellbeing in children and youth not only supports positive mental health, but also improves outcomes in school.Yet, Canadian schools do not consistently address social and emotional wellbeing as a core part of their role. In 2015, WellAhead began working in British Columbia to experiment with ways to better integrate wellbeing into K-12 education. In Advancing Wellbeing in Schools, WellAhead shares 15 lessons about education, philanthropy & systems change learned through this process.